If the height of the right circular cone is increased

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If the height of the right circular cone is increased by 200% and the radius of the base is reduced by 50%, then the volume of the cone ?

1. increases by 25%
2. increases by 50%
3. remains unchanged
4. decreases by 25%

Correct Option: D

Here, x = -50%, y = 200%
According to the formula Net effect
= [2x + y + x² + 2xy/100 + x²y/100²] %
= [-100 + 200 + 2500 - 20000/100 + 500000/10000]%
= [100 - 175 + 50] % = -25%